Nothing cures a cold. No medication, supplement, or home remedy can eliminate the virus once you’re infected. A cold typically peaks within two to three days and clears up in under a week on its own. But several strategies can meaningfully shorten that timeline or make you less miserable while your immune system does the work.
Why No Cure Exists
The common cold is caused by over 150 different viral serotypes, most of them rhinoviruses. These viruses mutate roughly once per replication cycle because their genetic copying machinery has no built-in error correction. A single amino acid change in the virus’s outer shell can make it resistant to an antiviral compound that worked the day before. This constant shapeshifting is why decades of pharmaceutical research haven’t produced a reliable cure, and why you keep catching colds even after having dozens of them.
Antibiotics are completely useless against colds. They kill bacteria, not viruses. Taking them for a cold won’t speed your recovery, and overusing them contributes to antibiotic resistance. The only scenario where antibiotics enter the picture is when a cold leads to a secondary bacterial infection, like a sinus infection or ear infection, which a doctor would need to confirm.
Zinc Lozenges: The Strongest Evidence
If one intervention comes closest to “curing” a cold, it’s high-dose zinc acetate lozenges. A meta-analysis of placebo-controlled trials found that zinc acetate lozenges delivering more than 75 mg of zinc per day shortened colds by an average of 42%. The effective dose in the studies ranged from 80 to 92 mg of zinc daily, spread across multiple lozenges throughout the day.
The key details matter here. The lozenges need to be zinc acetate specifically, and the total daily dose needs to be high enough. Many drugstore zinc products fall well below this threshold or use different zinc compounds. Low-dose zinc supplements showed no effect at all. You also need to start early: the benefit comes from beginning lozenges at the first sign of symptoms and continuing through the illness.
Vitamin C: Modest but Real
Vitamin C’s reputation as a cold fighter is partly deserved, partly overhyped. A large Cochrane review found that taking at least 200 mg of vitamin C daily shortened colds by about 9.4%, which translates to roughly half a day off a seven-day cold. That’s a real but modest effect.
There’s an important catch: this benefit came from people who were already taking vitamin C regularly before they got sick. Starting vitamin C after symptoms appear has a much weaker and less consistent effect. One trial tested 1.5 grams on the first day followed by 1 gram daily for five days and found only a 7% reduction in mild symptoms, with wide enough margins of error that the result could have been due to chance. If you want vitamin C to help, you need to be taking it before cold season, not after you start sneezing.
Honey for Cough Relief
Honey performs about as well as the standard over-the-counter cough suppressant dextromethorphan. A systematic review and meta-analysis found no significant difference between the two for cough frequency or severity. Honey did outperform diphenhydramine (the antihistamine found in some nighttime cold medicines) for both cough frequency and overall symptom scores.
A spoonful of honey in warm water or tea is a reasonable first choice for cough, especially since it has no side effects like drowsiness. One firm rule: never give honey to children under one year old due to the risk of botulism.
Over-the-Counter Medications That Help (and One That Doesn’t)
Cold medicines don’t fight the virus. They manage symptoms while you wait it out. Pain relievers and fever reducers like ibuprofen and acetaminophen address headaches, sore throats, and body aches. Antihistamines can reduce sneezing and a runny nose. Cough suppressants containing dextromethorphan can take the edge off a persistent cough, though as noted, honey works about equally well.
One major update worth knowing: the FDA has proposed removing oral phenylephrine from over-the-counter cold products after an advisory committee unanimously concluded it does not work as a nasal decongestant. Phenylephrine is the active ingredient in many popular daytime cold medicines that replaced pseudoephedrine on store shelves. If you’re buying a decongestant, look for pseudoephedrine, which is typically kept behind the pharmacy counter but doesn’t require a prescription in most states. Nasal spray forms of phenylephrine still work; it’s only the oral version that failed to demonstrate effectiveness.
Saline Rinses and Humidity
Saline nasal rinses (using a neti pot or squeeze bottle) are widely recommended, but the evidence is surprisingly thin. A Cochrane review found that most trials showed no significant difference between saline rinses and doing nothing. One larger trial in children did find a small improvement in nasal congestion scores, but the difference was so slight it may not be noticeable in practice. Saline rinses are safe and inexpensive, so they’re worth trying if they make you feel more comfortable, but don’t expect them to speed your recovery.
Indoor humidity has a clearer connection to comfort during a cold. Keeping your home between 40% and 60% relative humidity helps soothe irritated airways and may reduce the survival of viruses on surfaces. A basic humidifier in your bedroom during dry winter months can make breathing easier while you’re congested. Clean it regularly to prevent mold growth.
What Actually Matters: Rest and Fluids
The most effective thing you can do during a cold is also the least exciting: rest and stay hydrated. Your immune system requires energy to fight the infection, and sleep is when much of that work happens. Fluids keep mucus thin and easier to clear, prevent dehydration (especially if you have a fever), and warm liquids like broth or tea can temporarily relieve congestion.
The practical strategy for a cold looks like this: start zinc acetate lozenges at the first sign of symptoms, use pain relievers and pseudoephedrine as needed for comfort, try honey for cough, keep your air humidified, drink plenty of fluids, and sleep as much as you can. None of these are a cure. But stacking them together can turn a miserable week into a more tolerable few days.